只能比较一次，比较完之后直接退出。。。。。。

#include <stdio.h>
#include <ctype.h>

int main(void)
{
    int num1 = 0;
    int num2 = 0;
    char judge;
   
    do
    {
        puts ("Enter the two numbers.");
        scanf ("%d%d", &num1, &num2);
        
        if ( num1 > num2)
            printf ("\n%d greather than %d", num1, num2);
        else
            printf ("%d less than %d\n", num1, num2);
            
        puts ("Whether to continue?");
        scanf ("%c", &judge);
      
    }while(tolower(judge) == 'y');
   

    return 0;
}

2条scanf之间不能直通  中间需要添加清除缓冲区的语句

收到的鲜花

• 炎天 于 2016-11-01 16:04 送鲜花  6朵   附言：我很赞同

我在第一个scanf后面添加了一条语句fflush(stdin);但没用啊

没有问题啊

Enter the two numbers.
5 8
5 less than 8
Whether to continue?
y
Enter the two numbers.
8 5

8 greather than 5
Whether to continue?
y
Enter the two numbers.
5 5
5 less than 5
Whether to continue?
y
Enter the two numbers.
0 89
0 less than 89
Whether to continue?
y
Enter the two numbers.
89 52

89 greather than 52
Whether to continue?

#include <stdio.h>
#include <ctype.h>

int main(void)
{
    int num1 = 0;
    int num2 = 0;
    char judge;
    
    do
    {
        puts ("Enter the two numbers.");
        scanf ("%d%d", &num1, &num2);
        
        if ( num1 > num2)
            printf ("\n%d greather than %d\n", num1, num2);
        else
            printf ("%d less than %d\n", num1, num2);
            
        puts ("Whether to continue?");
        fflush(stdin);
        scanf ("%c", &judge);
       
    }while(tolower(judge) == 'y');
    

    return 0;
}

汗😓，手机编译器有问题，多谢了